Pass on unlimited time with section (6)
I believe the answer is:
impart
'pass on' is the definition.
('impart' can be a synonym of 'pass on')
'unlimited time with section' is the wordplay.
'unlimited' indicates the central letters (discard the edges or 'limits' of the word).
'with' means one lot of letters go next to another.
'section' becomes 'part' ('part' can be a synonym of 'section'**).
The middle letters of 'time' are 'im'.
'im'+'part'='IMPART'
(Other definitions for impart that I've seen before include "Give - relate" , "Divulge, pass on" , "Make known, relate" , "Transmit" , "17 down (anag)" .)